Drying apparatus



June 17, 1941. c. HUMMEL DRYING APPARATUS Filed Dec.

Kw Z2525:

Patented June 17, 1941 DRYING" APPARATUS Charles Hummel'g Niederuzwil, Switzerland, as-

signor to Geliriid'er Biihler, Uzwill; Switzerland Application Decemberrl4, 1939; Seriah No". 309;.2832 In Germany'February- 1; 1-939- 6 Claims. (Cl. 341-109) This invention relates to: drying apparatus and more particularly to apparatus for dryingpaste goods, such as vermicelli,. or the short. crooked. pieces sometimes calledielbows;? and the like.

It is an object of the invention tov provide-1a drying apparatus for paste goods comprising a. drying drum which is subdivided'into a plurality of axially extending: compartmentszthe. walls of the drum in such manner that each. compart I ment is successively traversed inopposite. directions by said stream of air.

A still further object of the invention is to enable the control of the temperature and the relative moisture content of the circulating air by the provision of adjustable shutters or flap valves for letting any desired proportion: of the:

circulating air escapev to the atmosphererandade mitting a corresponding amount of fresh air-into the apparatus.

Referring now" to 'the accompanying. drawing illustrating two forms of embodiment of the-invention,

Figure 1 shows a drying apparatus-in longitudinal section, additional air for drying being admitted by suction between the blower'andedrying chambers;

Figure 2 is a transverse section. through. the" drum;'

Figure 3 isa fragmentary longitudinal. section of an apparatus in which additional drying air is admitted in front of the blower between the.

drying chambers and the blower inlet; and

Figure 4 is a section along the line IV--IV' of Fig. 1.

The paste goods to be dried are fed'to the apparatus through the entrance chute into the revolving drum 2 comprising partition Walls 2' which subdivide the interior of the drum into' six sector-shaped axially extending compartments.

the rollers 4 engaging the drum by friction or by gearing. The internal sides ofthe outerwalls of the drum 2 and the partitions 2" are provided The drum is suitably mounted on rollers: 4 and driven by a pulley 3 connected to one of with: distributing: pallets 5i which'are destined to suitably:guid-eramrdistribute the goods within the drum.x The: walls :and partitions of the drum'are furtherprovidediwith' bafiles. 6' serving to effect" a. constant"; purlingcmotion of: the goods. Shuttersz-I are provided'for'closing'openings 1 ineach compartment of? the drum,. and: are" used for emptying the: drum 2:. The endwall 20 of the drum, in which the inlet opening zl. for the. goods to be-d riedl is provided; is; spaced" from the edges of. the; partitions: 2''? so: as to. form 3,? communicating: passagerbetween the v arious compartments: Orr the side of the drum opposed to the entrance chute I there is disposed a casing l.4scontaining' ablower 8:.for: creating the necessary circulating streamnof-z air; The end face: of the drum. 2: ad'- jacent the". casing: I4 is provided with a screen 9 through which air may penetrate, but which forms. a closure for the compartments and prevents the escape of goods: to bev dried. The cas ing I4 of the blower contains a partitionwall. 19 below which an. air filter 10' is: disposed to collect impurities; dust and the like from the air'leaving' the drum. A preheater- H above the partition l9, through which the air is- "forced prior to its entrance into the drum, may be; operated by steam, electricity, gas; etc. An adjustable flap. |2- is-providedbehind an opening l5zin'the' casing, M for. letting escape a certain amount of the air having passedthrough the drum, and a second adjusta-ble. flap i3 cooperating with the opening l-B in the casing serves: to regulatethe admission of fresh air into the circuit of drying air. The casingv Miorms. a fixed air inlet opening I1: and a fixed air-outlet opening !8 for the drum: 2:. Upon rotation of the drum, the screened end of each compartmentsuccessively passes in. front of the inlet and the outlet opening.

In: order; toprevent short-circuiting between the exhaust and: the inlet sides of the blower; the cylindrical extension: 22- of. the drum, having a. track 23-for one'of therollers 4; is provided with a number. of: radial partition walls 25 equal. to the number ofpartitions 2. of the drum and disposed. in axial alignment with these partitions. The openings l'! and I8 in the wall 25 of the casing 2-4 arez disposed above and. below the" partition: l 9fand' are of sector shape of such a sizethat none ofthe sector-shaped compartments'formed by the radial partitions 24- in the cylindrical extension. 22-. can; simultaneously communicatewith both openin'gsa I I and I 8.

The described; drying: apparatus operatesas follows: Thegoodstobe dried are fed through ment of the preheater and of the flaps l2 and 1 l3, controlling the admission of fresh air and the exhaust of moist air.

Owing to rotation of the drum, the compartments successively pass through the top and the bottom position, so that a stream of air alternately directed from right to left and then from left to right passes through each compartment. Thus, the conditions of drying are always identical in the entire drum. The filter l0 collects the dust which is formed in the drying goods, and after completion of the drying process, quite uniformly dried and extremely clean paste goods will be delivered by this drying apparatus.

As shown in the apparatus according to Fig. 1,

the blower 8 is disposed to draw air from the drum; in this case the air control flaps l2 and I3, when viewed in the direction of the air stream, are disposed after the blower.

In the modification shown in Fig. 3 the blower 8' is disposed to blow air into the drum. In this case, the flaps l2 and I3, when viewed in the direction of the air stream, are disposed ahead of the blower.

While the invention has been described in connection with the specific construction shown in the accompanying drawing, it is obvious that changes in the structure, form and arrangement of parts may be made without departing from the scope of the invention.

T claim:

1. An apparatus for drying paste goods, comprising a rotatable drum adapted to receive the goods to be dried, partition walls Within said drum for subdividing the drum in a plurality of axially extending compartments communicating with each other at one of their ends, means for distributing the goods within said compartments. a screen for closing the other ends of said compartments, means for creating a circulating stream of air passing through the drum, and means adjacent the screened ends of said compartments providing fixed air inlet and outlet openings whereby upon rotation of said drum each compartment successively passes with the screened end thereof in front o-f said air inlet and outlet openings.

2. An apparatus for drying paste goods, comprising a rotatable drum adapted to receive the goods to be dried, partition walls within said drum for subdividing the drum in a plurality of axially extending compartments communicating with each other at one end of the drum, means for distributing the goods within said compartments, bafiles within the compartments for imparting a purling motion to the goods to be dried, a screen disposed across the other end of the drum and forming aclosure for said compartments, a casing disposed adjacent the screened end of the drum, means in said casing for creatmg a circulating stream of air passing through the drum, said casing providing fixed air inlet and outlet openings for said drum adjacent the screened end thereof whereby upon. rotation of the drum each compartment successively passes in front of said air inlet and outlet openings and each compartment is successively traversed in opposed directions by said stream of air, and means in said casing for letting escape a portion of the circulating air and for admitting a corresponding portion of fresh air.

3. An apparatus for drying paste goods, comprising a drum adapted to contain the goods to be dried, means for mounting said drum for rotation, partition walls Within said drum for subdividing the drum into a plurality of axially extending compartments communicating with each other at one end of the drum, means for feeding the goods to be dried into said compartments at said end of the drum, means for distributing the goods within the compartments, a screen disposed at the other end of the drum and forming a closure for said compartments, a casing disposed adjacent to the screened end of the drum, a blower in said casing for creating a circulating stream of air traversing said screen and the drum, said casing providing fixed inlet and outlet openings for said drum adjacent the screened end thereof whereby upon rotation thereof each compartment successively passes in front of the air inlet and outlet openings and each compartment is successively traversed in opposed directions by said stream of air, means for preheating the stream of circulating air in said casing, an air filter arranged to be traversed by the circulating stream of air, and means in said casing for letting escape a portion of the circulated air and for admitting a corresponding portion of fresh air.

4. An apparatus for drying paste goods, comprising a drum adapted to contain the goods to be dried, means for rotatably mounting said drum, partition Walls within said drum for sub dividing the drum into a plurality of axially extending compartments communicating with each other at one end of the drum, means for feeding the goods to be dried into said compartments at said end of the drum, means for distributing the goods within the compartments, a screen disposed at the other end of the drum and forming a closure for said compartments, a casing disposed adjacent to the screened end or the drum, a blower in said casing for creating a circulating stream of air traversing said screen and the drum, said casing providing fixed inlet and outlet openings for said drum adjacent the screened end thereof whereby upon rotation thereof each compartment successively passes in front of the air inlet and outlet openings and each compartment is successively traversed in opposed directions by said stream of air, means for preheating the stream of circulating air in said casing, and means in said casing for letting escape a portion of the circulated air and for admitting a corresponding portion of fresh air.

5. A drying apparatus comprising a rotatable drum adapted to receive the goods to be dried, partition walls within said drum for subdividing the drum in a plurality of axially extending drying compartments communicating with each other at one end of the drum, means for creating a circulating stream of air passing through the drum, a stationary member disposed at the other end of the drum and'provided with inlet and outlet openings for said circulating stream of air, and means for rotating the drum, whereby said compartments successively communicate with said stationary inlet and outlet openings and each compartment is successively and including a stationary wall adjacent the end 10 of the drum, said wall being provided with inlet and outlet openings for a circulating stream of drying air passing through the drum, and means for rotating said drum whereby said compartments successively communicate with said stationary inlet and outlet openings and each compartment is successively traversed in opposite directions by said stream of air.

CHARLES HUMMEL. 

